Translation of Ostersonntag

Can you translate: Are you using the firefox browser? Install this tool in your browser window. The ones I suggested the other day are the most useful ones, because we would use it for generic terms which differ from Spanish.
I think it's a good idea to fly to Antigua to a language school. I feel more confident with the grammar in Spanish. Perhaps it would be better if the school would arrange the accommodation.
I think you learn best through writing, talking and reading. Since I'm currently busy at my work and since I have no time for courses, I have no improvement plans for my Spanish studies.